Question # 1

What is the reason of ionic solids for not conducting electricity?

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free electrons are less

ions don't have translatory mention.

ions don't have translatory mention

the coordination number of the ion is very high.

If Cl2 is passed through hot NaOH. NaCIO3 is formed and the oxidation number of CI changes from

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-1 to 0

0 to +5

0 to-1

0 to +1

what is it difficult to cook food at high as compared to at sea level? Choose the correct reason.

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H-bonding in H₂O changes with height

temperature at the top of mountain is low

density of water decreases at the mountain

boiling point of water decreases at the mountain

Triple point of water is

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273 K

373 K

203 K

193 K

Corrundam is ore of which element?

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Al

Th

In

Mg

A state function which describes together the internal energy and product of pressure and volume is called

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Enthalpy

internal energy

Work

Kinetic energy

When a compressed gas is allowed to pass through a nozzle of a jet into a region of low pressure, it produces

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cooling

vaporization

fusion

expansion

The boiling point of radon (211k)id higher than boiling point of helium (4.4k). This is due to the reason that:

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the atomic mass Rn is larger than that of He

the dispersion forces between Rn atoms are more prominent than between he atoms

rn atomic number of Rn is larger than that of He

In van der Waal's equation of state of the gas law,the constant 'b' is measure of

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Intermolecular repulsions

Intermolecular collisions per unit volume

Volume occupied by the molecules

Intermolecular attraction

Which of the following element has high m.p and b.p, it acts as a reducing agent, and can react with bases?

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Sr

Ca

Be

Mg

Acetic acid reacts with thionyl chloride to form acetyl chloride, which species acts as nucleophile in the reaction

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SO3

SO2

Cl-

No nucleophile is formed

A basic buffer solution can be prepared by mixing

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Strong acid and its salt with weak base

Weak base and its salt with strong acid

Strong base and its salt with weak acid

Weak acid and its salt with strong base

Which one of the following is not true relationship

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Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water

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4x6.022x10ê23

1×6.022x10ê23

2x6.022 x10ê23

2x6.022x10ê22

Propanone does not undergo

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Oxime formation

Reduction of Fehling solution

Hydrazone formation with hydrazine

Reaction with HCN

Esters have fruity smell and are used as artificial favours. Amyl acetate gives flavour of

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Banana

Jasmine

Pineapple

Orange

The unit of R depends on

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Mole

Pressure volume

Temperature

None of these

A temperature at which two cyrstalline forms of a substances coexist in equilibrium is called

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standard temperature

critical temperature

transition temperature

absolute temperature

Group VIB of transition elements contains

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Zn. Cd. Hg

Cr. Mo, w

Fe. Ru, Os

Mn. Te. Re

Cooling happens under the Joule Thomson Effect due to sudden:

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Contraction.

Absorption.

Expansion.

All of above.

What is the formula of magnesite?

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MgSO4. 7H2O

MgCO3

CaCO3

PbS

The graph between P onγ-axis and 1/V at x-axis for a given mass of a gas at temperature T is a

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straight line

curved upward

curved downward

circular

The non polar gases of low polarizability have a very:

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Low critical temperature

Stable critical temperature

High critical temperature

Van der Waals equation explains the behaviour of

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Real gases

Mixture of gases

Ideal gas

Diatomic gases

The enzyme which is found in saliva, accelerates the conversion of starch into sugar is

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Pepsin

Thrombin

Ptyalin

Fumarase

The deviation of a gas from ideal behaviour is maximum at

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-10°C and 5.0 atm

100°C and 2.0 atm

-10°C and 2.0 atm

0°C and 2.0 atm

Which one of the following pair of atoms is most likely to form an inoic bond?

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Na and F

C and F

N and F

O and F

Number of moles present in 0.6 gram of silica is (Atomic mass Si = 28, O=16)

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0.01 mole

0.064 mole

0.044 mole

0.054 mole

The gas which obey's the gas laws at all conditions of temperature and pressure is called:

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Perfect gas

Super gas

Ideal gas

Real gas

Which of the following pair has the same no. of electrons in d- subshell

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Sc+3,Ti+3

Mn+2,Fe+3

Ti+3,V+3

Cr+3.Co+2

The correct value of the gas constant R is close to

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0.082 litre-atm K^-1 mol^-1

0.082 litre-atm^-1 K mol

0.082 litre-atm K

0.082 litre-atm^-1 K mol^-1

The sole produets of combustion analysis are

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CO2 and NH3

H2O and Mg(CIO4)2

CO2 and KOH

CO2 and H2O

Which of the elements has seven electrons in d-subshell?

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Zn

Co

Cu

Fe

One kilo calorie is equal to

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4.184J

1000J

4184J

1kJ

Stability of Cu-metal is due to filled of d-orbital

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Half

Completely

Partially

Quarterly

In Boyle's law which of the following pair remains constant:

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Temperature and quality of a gas.

Pressure and quality of a gas.

Temperature and pressure.

Temperature and quantity of a gas.

The total K.E. of one mole of an ideal gas is given by:

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1/2 RT

3/2 RT

1/2 KT

3/2 KT

Which of the following has isomorphous structure

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NaF

S

Sn

N

How many CI^- ions are there around Na+ ion in NaCI crystal?

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3

4

6

8

Elements of group ll-A are called

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f-block elements

s-block elements

p-block elements

d-block elements

K2SO4, and K2Cr2O4, are isomorphous solids and exist in

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cubic form

orthorhombic form

trigonal form

tetragonal

Which of the following is the correct equation to calculate relative molecular mass of a gas

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M=mPRTV

M=mPR/VT

M=PV/mRT

M=mRT/PV

Point out the substance which has maximum vapour pressure at a given temperature?

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Acetone

Water

Ethanol

Acetic acid

What is the numerical value of 'R; (the gas constant) in S.I units?

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83143 J/mole/K

Avogadro's law

83.143 J/mole/K

8.3143 J/mole/K

suppose that an ocean of mercury replaced all the air of the air of the earth . How deep would this ocean have to be to exert the same pressure as the air:

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77cm

76cm

79cm

78cm

The examples of a hexagonal system is

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sugar

graphite(a=b not equal to c) {Alpha =beta. not equal to gamma}

sulphur

diamond

Choose the example having hexagonal system:

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graphite

sugar

sulphur

diamond

At compromise distance the forces dominating between atoms are

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repulsive forces

attractive forces

Dipole induced dipole force

H-bonding

The volume of given mass of gas is directly proportional to absolute temperature when pressure is kept constant this is called

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Boyle's law

Charles's law

Graham's law

Dalton's law

The number of moles of CO2 which contain 16g of oxygen

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0.25

1.00

1.50

0.50

Enzymes are

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simple proteins

derived proteins

compound proteins

conjugated proteins

The boiling of water may be 120°C, when the external pressure is

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greater than 760 torr

less than 760 torr

equal to 760 torr

variable

Which of the following tends to approach ideal gas like behavior at R.T.P

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ammonia

neon

carbon dioxide

chlorine

Which pair of gases do not obey Dalton's law of partial pressures?

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H2 and He

NH3and HCl

H2 and O2

N2 and O2

If ionic product is equal to Ksp then the solution is

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Unsaturatec

Ideal

Supersaturated

Saturated

Air can be distilled fractionally because the constiltuents of the air:

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have different densities

can be liquefied

are gases at room temperature

have different boiling points

The alkaline earth metals are called so because they

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form alkaline solution and are present in earth crust as minerals

form alkaline solution and are found in nature states

are present in earth crust

are present in earth crust as their minerals

chemist was able to measure the value of lattice energy of KCI to be 690 kj/mol.

From this experiment , he concluded that:

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lattice energy of KBr is 665 kj/mol and that of Ki is 630 kj/mol

lattice energy of KBr is 765 kj/mol and that of Kl 730 kj/mol

lattice energy of KBr is 730 kj/mol and that of Ki 765 kj/mol

lattice energy of KBr is 630 kj/mol and that of kL 665 KJ/mol

Someone is saying that glass must be a super cooled liquid. The reason that he might have in his mind is that glass has :

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definite shape

definite-volume

crystalline structure

no crystalline structure

The typical range of the H-bonding is:

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1-2 kj/mol of bonds

5-25 kj/mol of bonds

500 kj/mol of bonds

The maximum number of isomer for an alkene with the molecular formula C2H8

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2

3

4

5